Donald Trump, elevated by a pair of victories in Kentucky and Louisiana on Saturday, said he's ready for a head-to-head battle with Texas Sen. Ted Cruz.

"I want Ted one-on-one," Trump said at a late-night news conference in West Palm Beach, Fla., urging Florida Sen. Marco Rubio to exit the GOP primary after he failed to win one of the four contests Saturday.

Mar. 5, 2016, 6:34 p.m.

A common theme in the Democratic presidential primary continued on Saturday: Hillary Clinton claimed victory in a state where African Americans dominate the electorate, while Bernie Sanders found support in states where whites are the majority.

Clinton, the frontrunner for the Democratic presidential nomination, won Louisiana's primary, widening her delegate lead against Sanders.

Throughout the South -- from South Carolina to Alabama -- black voters dominate Democratic primaries and have overwhelmingly backed Clinton. Last week in South Carolina about 60% of the Democratic electorate was black, and about 84% backed Clinton.